The electron-cloud instability in PEP-II: an update

Author

Furman, M.A. ; Lambertson, G.R.

Author_Institution

Lawrence Berkeley Lab., CA, USA

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

1617

Abstract

We present an update on the estimate of the growth time of the multi-bunch transverse instability in the PEP-II collider arising from the interaction of the positron beam with the accumulated electron cloud. We estimate the contributions to the growth rate arising from the dipole magnets and from the pumping straight sections. We emphasize those quantities upon which the instability is most sensitive. The simulation includes measured data on the secondary emission yield for TiN-coated samples of the actual vacuum chamber. Although our analysis is still in progress, we conclude that the instability risetime is of order 1 ms, which is well within the range controllable by the feedback system

Keywords

accelerator magnets; colliding beam accelerators; electromagnets; electron accelerators; electron beams; particle beam bunching; particle beam stability; storage rings; PEP-II; TiN; dipole magnets; electron collider; electron-cloud instability; feedback system; growth time; multibunch transverse instability; positron beam; pumping straight sections; storage rings; Clouds; Colliding beam devices; Control systems; Electron beams; Elementary particle vacuum; Geometry; Magnetic analysis; Magnets; Optical control; Positrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.750777

Filename

750777